ABB ACH550-BCR, Руководство пользователя

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1-102 ACH550-UH User’s Manual
Parameters
Group 13: ANALOG INPUTS
This group defines the limits and the filtering for analog inputs.
Group 13: Analog Inputs
Code Description Range Resolution Default S
1301
MINIMUM AI1 0.0…100.0% 0.1% 20.0%
Defines the minimum value of the analog input.
• Define value as a percent of the full analog signal range. See example below.
• The minimum analog input signal corresponds to 1104
REF
1
MIN
or 1107
REF
2
MIN
.
•
MINIMUM AI
cannot be greater than
MAXIMUM AI
.
• These parameters (reference and analog min. and max. settings) provide scale and offset adjustment for the
reference.
• See the figure at parameter 1104.
Example:
To set the minimum analog input value to 4 mA:
• Configure the analog input for 0…20 mA current signal.
• Calculate the minimum (4 mA) as a percent of full range (20 mA) = 4 mA / 20 mA · 100% = 20%
1302
MAXIMUM AI1 0.0…100.0% 0.1% 100.0%
Defines the maximum value of the analog input.
• Define value as a percent of the full analog signal range.
• The maximum analog input signal corresponds to 1105
REF
1
MAX
or 1108
REF
2
MAX
.
• See the figure at parameter 1104.
1303
FILTER AI1 0.0…10.0 s 0.1 s 0.1 s
Defines the filter time constant for analog input 1 (
AI
1).
• The filtered signal reaches 63% of a step change within the time
specified.
1304
MINIMUM AI2 0.0…100.0% 0.1% 20.0%
Defines the minimum value of the analog input.
• See
MINIMUM AI
1 above.
1305
MAXIMUM AI2 0.0…100.0% 0.1% 100.0%
Defines the maximum value of the analog input.
• See
MAXIMUM AI
1 above.
1306
FILTER AI2 0.0…10.0 s 0.1 s 0.1 s
Defines the filter time constant for analog input 2 (
AI
2).
• See
FILTER AI
1 above.
100
63
%
Unfiltered signal
Filtered signal
Time constant
t